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Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
Property, plant and equipment, net at December 31 was as follows:
 
 
2013
 
2012
 
(Dollars in thousands)
Land
$
60,783

 
$
60,287

Buildings and improvements
328,324

 
326,405

Machinery and equipment
2,372,648

 
2,281,694

Construction in progress
53,382

 
63,608

 
2,815,137

 
2,731,994

Accumulated depreciation
(1,696,694
)
 
(1,633,185
)
 
$
1,118,443

 
$
1,098,809